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I have graphed the parametric equation and located when the slope is equal to zero. Now I want to take this value and turn it into the max, value or y value. How can I do this? enter image description here

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d = Pi/4;
v0 = 400;
g = 9.8;

x[t_] := t v0 Cos[d]
y[t_] := t v0 Sin[d] - 1/2 g t^2

max = Maximize[y[t], t]

enter image description here

ParametricPlot[{x[t], y[t]}, {t, 0, 70},
 Epilog -> {Red, PointSize[0.02], Point[{x[t] /. max[[2]], max[[1]]}]}]

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Or

sol = First @ Solve[D[y[t], t] == 0, t]

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{x[t], y[t]} /. sol

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